Kate chose a beautiful blue lace dress by Temperley London for the occasion – and we could see just a hint of a baby bump. It featured flared lace sleeves and a velvet bow at the collar. She paired the frock with black court shoes and a clutch bag.

Getty Images

The Duchess regularly chooses to wear the British designer and did so on a few occasions during her last two pregnancies.

Last night, a royal aide remarked that Kate was "delighted" to be at the event but stressed that she would not be back to her full royal duties yet as she was still suffering from Hyperemesis Gravidarum – a severe case of morning sickness that she has been forced to deal with for all three of her pregnancies. The condition was so severe last month that she was forced to miss Prince George's first day of school.

HARPER'S BAZAAR, PART OF THE HEARST UK FASHION & BEAUTY NETWORK
Harper's BAZAAR participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites.